CVE-2026-59309 in vCenter
Summary
by MITRE • 07/30/2026
VMware vCenter contains an authentication bypass vulnerability in the VMware Directory Service. A malicious actor with network access to vCenter may exploit this issue to bypass authentication and gain unauthorized access to the system.
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical authentication bypass flaw within VMware vCenter's VMware Directory Service component, which serves as the central identity management system for the virtualization platform. The weakness allows attackers to circumvent the standard authentication mechanisms that should normally validate user credentials before granting access to sensitive administrative functions. This issue directly impacts the foundational security posture of VMware environments where vCenter serves as the primary management interface for virtual infrastructure operations.
The technical exploitation of this vulnerability occurs through network-based attacks that target specific endpoints within the VMware Directory Service implementation. Attackers can leverage crafted requests or manipulated service communications to bypass credential validation processes, effectively gaining access to administrative interfaces without proper authorization. This type of flaw typically stems from improper input validation or flawed session management within the directory service components that handle user authentication requests.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it provides attackers with full administrative privileges over the vCenter server and all managed virtual environments. Once authenticated, malicious actors can manipulate virtual machines, modify network configurations, access sensitive data stored within the virtual infrastructure, and potentially escalate their access to other systems within the broader network ecosystem. This creates a significant risk for organizations that rely on VMware vCenter for mission-critical operations and data protection.
Security professionals should implement immediate mitigations including applying official VMware patches, implementing network segmentation to limit access to vCenter services, enforcing strict firewall rules targeting directory service ports, and monitoring for suspicious authentication attempts. The vulnerability aligns with CWE-287 which addresses improper authentication issues, and maps to ATT&CK technique T1078 for valid accounts and privilege escalation. Organizations must also conduct comprehensive security assessments of their VMware environments to identify any additional attack surfaces and ensure proper access controls are in place across all management interfaces.